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采用反应合成法制备了AgSnO2(8)Y2O3(2)电接触材料,并对其进行变形程度为20%的挤压,研究了不同退火温度对材料显微组织与性能的影响.结果表明,退火过程中氧化物颗粒易于在晶界偏聚,阻碍晶界的移动和位错的重排,从而抑制了再结晶的进行.随着退火温度的升高,材料的显微硬度不断下降,而导电率不断提高.材料的断裂方式为塑性断裂,变形主要在Ag基体上进行,氧化物颗粒可起到阻碍变形、强化材料的作用.在直流负载条件下,AgSnO2(8)Y2O3(2)材料表现出边缘优先烧蚀的特性.
AgSnO2 (8) Y2O3 (2) electrical contact material was prepared by reaction synthesis method, and the effect of different annealing temperature on the microstructure and properties of the material was studied by extrusion with a deformation degree of 20% .The results showed that annealing During the process, oxide particles tend to segregate at the grain boundaries, hindering the movement of the grain boundaries and rearrangement of the dislocations, thereby inhibiting the recrystallization. As the annealing temperature increases, the microhardness of the material continues to decrease while the conductivity The fracture rate of the AgSnO2 (8) Y2O3 (2) material is increased, the fracture mode of the material is plastic fracture, the deformation is mainly carried out on the Ag matrix, and the oxide particles can hinder the deformation and strengthen the material. Out of the edge of the preferred erosion characteristics.